Add missing headers in WebKit/public to GN

content/renderer/text_input_client_observer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/text_input_client_observer.h"
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "build/build_config.h"
 #include "content/common/text_input_client_messages.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/render_widget.h"
 #include "ipc/ipc_message.h"
 #include "ppapi/features/features.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
+#include "ui/gfx/geometry/rect.h"
+
+#if defined(OS_MACOSX)
 #include "third_party/WebKit/public/web/mac/WebSubstringUtil.h"
-#include "ui/gfx/geometry/rect.h"
+#endif
 
 namespace content {
 
 namespace {
 uint32_t GetCurrentCursorPositionInFrame(blink::WebLocalFrame* localFrame) {
   blink::WebRange range = localFrame->selectionRange();
   return range.isNull() ? 0U : static_cast<uint32_t>(range.startOffset());
 }
 }
 
@@ skipping 130 matching lines @@
   std::unique_ptr<const mac::AttributedStringCoder::EncodedString> encoded(
       mac::AttributedStringCoder::Encode(string));
   Send(new TextInputClientReplyMsg_GotStringForRange(
       render_widget_->routing_id(), *encoded.get(), baselinePoint));
 #else
   NOTIMPLEMENTED();
 #endif
 }
 
 }  // namespace content